All of the offenses are a class D felony, each punishable by up to five years in prison and a $7,500 fine, according to police.

Investigator Blaine Hamill said this is the largest indoor growing operation he has seen since joining the Altoona police department 14 years ago.

“You don’t see these often. These are rare to go to this extent,” said Matherly, who joined the department 18 months ago.

Jacob Alexander Willis.

Upon executing a search warrant, officers discovered an intricate system for watering, heating and growing plants and packaging marijuana in the basement, Matherly said. In addition to nearly 200 plants, officers found already cultivated and packaged marijuana in the home.

Matherly said it appeared the entire home, where Willis lived, was involved in the operation.

“It’s part of an investigation and that’s what led us to the search warrant,” Matherly said, declining to say how long officers had monitored Willis or his residence.